Multiple-fuse plug



J. M. NEIDIG MULTIPLE FUSE 3LUG May 27 1924.

' Filed July 7, 1922 [MENTOR Jmesllbdffl' ATTORNEYS Patented May 27, 192 4.

UNITED STATES- JAMES'M. NEIDIG, 0F HARRISBURG, PENNSYLVANIA.

MULTIPLE-FUSE PLUG.

Application filed July 7,

To all whom it may concern Be it known that I, JAMES M. NEIDIG, a citizen of the United States, and a resident of Harrisburg, in the county of Dauphin and State of Pennsylvania, have invented new and useful Improvements in Multi le- Fuse Plugs, of which the following is a ull, clear, and exact description.

This invention relates to multiple fuse plugs.

The general object of the invention is the provision of a cheap, simple and efiicient fuse plug containing more than one fuse so that when one fuse is blown the other may be utilized to replace it.

A further object of the invention is the provision of a multiple fuse plug divided into two compartments by means which allows the gases, formed by the blowing of a fuse, to expand throughout the two compartments, thus giving a large expansion area.

' Another object of the invention is the provision of a multiple fuse plug, the casing of which is provided with removable ends so that the fuses may be replaced.

These objects are accomplished by using an insulating casing provided with removable ends and supplying a threaded band and a contact terminal connected by the fuse, in conjunction with each end, and mounting in the casing means for protecting one fuse when the other is blown, said means being provided with means for allowing the expansion of gases generated by the blowing of a fuse throughout the whole casing. 1 These and other objects of the invention will be more clearly understood from the following detailed description and accompanying drawings, in which- Figure 1 is a vertical section through the fuse Figure 2 is an end view of the assembled use;

Figure 3 is a section Figure 1; t

Figure 4 is a section through a modification of the fuse showing two removable ends.

Referring to the above-mentioneddrawings,'a casing 10 of insulating material 1s provided with a removable end 11. Each end of along the line 3-3,

.. the casing 10 is threaded as at 12 and 13 and has mounted thereon threaded metallic bands 14 and 15 which engage with the 1922. Serial No. 573,322.

threaded portions 12 and 13, respectively. The threaded metallic band 14 serves to re tain the removable end 11 in position. Projecting through openings in each end of the casing are spring arms of contact members 16 and 17.

The casing chambervis divided into two compartments 18 and 19 by means of a plate 20 which is'mounted on a circumferential shoulder 21 extending around the inner face of the casing and near its centre line. The plate 20 is provided with an opening 22 which allows communication between the compartments 18 and 19 thus allowing greater expansion of the gases that may be generated upon the blowing of one of the fuses to be described later.

A fuse 23 extends through an opening 24 in the removable end 11 and connects the Contact member 16 with the metallic band 14. A drop of solder would preferably be used for attaching the end of the fuse 23 to the metallic band 14. A fuse'25 extends through an opening 26 in the wall of the casing 10 and serves to connect the contact member 1% to the metallic band 15. The end of the fuse 25 is rigidly attached to the band 15 so as to retain the band in osition on the casing 10. The plate 20 WTllCll is located between the fuses 23 and 25 serves to protect one fuse from the other when either is blown.

A modification of the fuse isshown in" provided with two removable ends 11 and 27. The removable end 27 is retained in position on the casing by means of the metallic band 15. The remainder of the fuse is the same as described above. In order-to remove the end 11 the metallic band 14 is unscrewed. This gives access to the com partment 18.

The above description sets forth a multiple fuse plug so constructed that when one fuse is blown disconnecting a circuit the fuse plug may be reversed, utilizing the oth- 'er fuse to re-establish the circuit. This provides a simple and efiicient multiple fuse that may be constructed at a cost but little in excess of the cost of a single fuse.

I would state in conclusion that while the illustrated examples constitute practical embodiments of my invention I do not limit,

the spirit of the invention as defined in the scribed, comprising an insulating casing having removable ends, means for dividing the casing chamber into two compartments,

' said means being provided with an opening to allow communication between said compartments, threaded bands mounted on each end of said casing, retaining said removable ends in position, contact members projected through the ends of said casing, fuses located in each compartment, each fuse serving to connect the contact member extending into its compartment to the threaded band mounted on the same end-of the casing as said contact terminal.

2. A multiple fuse plug, comprising a tu bular casing of insulating material, a circumferential shoulder formed in the casing near its center, means for closing the end of the casing, means mounted on the shoulder dividing the easing into two compartments, and fuses mounted in each compartment.

3. A multiple fuse plug of-the class described, comprising a casing of insulating material having both ends threaded and provided with removable end pieces, a circumferential shoulder formed in said casing, means mounted on said shoulder for dividing the casing chamber into two compartments, said means being provided with an opening allowing communication between the compartments, threaded metallic bands mounted on each end of the casing, said bands serving to retain the end pieces in position, contact members projected through the end pieces, and fuses, one

' mounted in each compartment, for connecting the contact member extending into its compartment with the threaded metallic band associated with the same end of the casin as the contact member.

4. 1 k multiple fuse plug of the class de scribed, comprising a hollow cylindrical casing having both ends threaded and provided withremovable end pieces, threaded metallic bands for a forming terminals pieces, a fuse connecting each contact memer with the metallic band associated with the same end of the casing as th contact member, a circumferential shoulder formed on the inner wall of said casing, and a plate mounted on said shoulder dividing the casing chamber into two compartments, said plate having an opening extending therethrough for allowing gases to pass from one compartment to the other.

5. A multiple fuse plug of the class described, comprising a hollow cylindrical casing provided with removable ends and having both ends of its outer wall threaded, a threaded metallic band mounted on each end of the casing serving to retain the ends in position and forming terminals, contact members projected through each end of the casing, a fuse connecting each contact member to the metallic band associated with the same end of the casin and a plate mounted in the casing and dividing the casing chamber into two compartments, said plate being provided with an opening for allowing gases expanding in one compartment to pass into the other.

6. A multiple fuse plug of. the classdescribed, comprising a hollow cylindrical casing of insulating material having removable ends, said caslng having its outer surface threaded, threaded metallic bands mounted on each end of said casing serving to retain the movable ends in position,

contact members projecting through each end, a fuse connecting each contact member with the metallic band associated with the same end of the casing, said fuses being detachably connected to the bands in a manner to prevent the removal of the bands vfrom the casing, a circumferential shoulder formed on the inner face of the casing, a plate having an opening therein mounted on said shoulder, and means provided in conjunction with said plate for retaining it-in position on the shoulder.

JAMES M. NEIDIG. 

